I'd like to use an iPad charger to charge my new iPhone 4. However, only if this won't damage the iPhone. I know that the iPad charger provides more power, so this will charge the battery faster. Is this harmful? Both chargers have the same USB connection.

I can't find any Apple Support page about this issue. Using Google I can only find people who want to use an iPhone charger to charge the iPad, which is ok but slow. Both the iPhone 4 and the iPad are not yet for sale in the Netherlands, so calling Apple didn't work.

The iPad charger has a higher output wattage (I think 10 watts) due to the iPad having hefty charging requirements. However it is perfectly fine to use the iPad charger with iPhone. If anything it'll likely charge the phone a bit faster.

Yes, it is! In fact it's safe to use the little iphone charger to charge the iPad too. If you take apart the charger, you'll notice there's a USB controller in there. The chip negotiates the maximum safe current with the device.

So, it takes the 120V*15A=1800W power from the outlet and converts that power so that it will be transmitted at a much lower rate, giving the device less of that wattage.

I'm not sure if the earlier post by someone was trying to say that the iPhone has a particular resistor of it's own and so any different level and rate of power would simply dissipate, but wouldn't that still be stressful on that resistor?

I think, in the end, one would be better off spending the couple of bucks for an iPhone charger.

If there was absolutely no difference, then why would they make different chargers with different values? There would only be a need for stronger chargers for larger, more powerful devices, but the inverse (using that more powerful charger for a smaller, less powerful device) wouldn't make any sense.

So, it takes the 120V*15A=1800W power from the outlet and converts that power so that it will be transmitted at a much lower rate, giving the device less of that wattage.

I'm not sure if the earlier post by someone was trying to say that the iPhone has a particular resistor of it's own and so any different level and rate of power would simply dissipate, but wouldn't that still be stressful on that resistor?

I think, in the end, one would be better off spending the couple of bucks for an iPhone charger.

If there was absolutely no difference, then why would they make different chargers with different values? There would only be a need for stronger chargers for larger, more powerful devices, but the inverse (using that more powerful charger for a smaller, less powerful device) wouldn't make any sense.

Just use the corresponding charger.

Back to the first question again, please: Is it safe to use an iPad charger to charge the iPhone 4?

This last post above is confusing in the light of all the contrary experience from the other posts.

Seems like my iPhone charges a bit faster with the 10 watt iPad charger. The reason for different chargers is obvious if you've ever tried to charge an iPad with an iPhone charger or a USB port though.

I'd like to use an iPad charger to charge my new iPhone 4. However, only if this won't damage the iPhone. I know that the iPad charger provides more power, so this will charge the battery faster. Is this harmful? Both chargers have the same USB connection.

I can't find any Apple Support page about this issue. Using Google I can only find people who want to use an iPhone charger to charge the iPad, which is ok but slow. Both the iPhone 4 and the iPad are not yet for sale in the Netherlands, so calling Apple didn't work.

I hope someone with the same issue, can help me

I was skeptical at first.. because of some bad reviews I read. But one day I had no other charger except my iPad charger. It works. Charges just as fast.. or faster (I'm not sure). Using it right now, actually. haha.